Is a man obligated to prioritize his family (wife and children) for Hajj, or his married sisters?

A man is not obligated to sponsor the Hajj of his wife, children, or sisters, because the obligatory financial support (nafaqah) does not include Hajj expenses; rather, it falls under the category of kindness and benevolence. Sheikh Ibn Uthaymeen clarified that Hajj is conditional upon ability (istita'ah), and a father is not obligated to finance the Hajj of his poor child, nor vice-versa. However, a child's fulfilling of a parent's request for Hajj, if the child is capable, is considered an act of commanded righteousness (birr). Providing for one's family and dependents is among the best and most rewarding forms of charity. In spending, one should start with oneself, then the wife, then the children (or children then wife), then the servant, and then those who follow them in priority. A man should ideally begin sponsoring Hajj for his children, then his wife, then his sisters, if he cannot sponsor all of them simultaneously.